Virulence properties of Escherichia coli isolated from ostriches with respiratory disease

Virulence properties of Escherichia coli isolated from ostriches with respiratory disease

Autor Knobl, T. Google Scholar
Baccaro, M. R. Google Scholar
Moreno, A. M. Google Scholar
Gomes, TAT Google Scholar
Vieira, MAM Google Scholar
Ferreira, CSA Google Scholar
Ferreira, AJP Google Scholar
Instituição Universidade de São Paulo (USP)
Univ Guarulhos
Universidade Federal de São Paulo (UNIFESP)
Resumo Eight Escherichia coli isolates from ostriches with respiratory disease were investigated for the presence of genes encoding the following adhesins: type I pili (fim), pili associated with pyelonephritis (pap), S fimbriae (sfa), afimbrial adhesin (afaI), temperature regulated adhesin, curli (crl, csgA) and temperature-sensitive hemagglutinin (tsh). Genes for heat labile (LT) and heat stable (STa and STb) enterotoxins, Shiga toxins (stx1 and stx2), cytotoxic necrotizing factor 1 (cnf), alpha-haemolysin (hly) and aerobactin (aer) production were also investigated. Other characteristics investigated were the presence of hemagglutination activity, growth on an iron-deficient medium, aerobactin production, serum resistance, adherence to chicken tracheal cells, pathogenicity for day-old chicks, and serogroup. Serogrouping showed that four isolates belonged to serogroup O2, two to serogroup O78, one to serogroup O9, and one to serogroup O21. the virulence genes found were: firn in all eight isolates, csgA in seven, aer in six, and pap, crl and tsh in one isolate each. All isolates analyzed were positive for mannose-resistant hemagglutination, adhered in vitro to ciliated tracheal epithelium, grew on iron-deficient medium, and showed serum resistance. Pathogenicity tests on day-old chickens revealed one highly pathogenic isolate, three of low pathogenicity and four isolates with intermediate pathogenicity. (C) 2001 Elsevier Science B.V. All rights reserved.
Palavra-chave ostrich
respiratory disease
Escherichia coli
virulence factors
Idioma Inglês
Data de publicação 2001-10-22
Publicado em Veterinary Microbiology. Amsterdam: Elsevier B.V., v. 83, n. 1, p. 71-80, 2001.
ISSN 0378-1135 (Sherpa/Romeo, fator de impacto)
Publicador Elsevier B.V.
Extensão 71-80
Fonte http://dx.doi.org/10.1016/S0378-1135(01)00403-5
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000170978800007
Endereço permanente http://repositorio.unifesp.br/handle/11600/26646

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